[Original] C # xml operations

1. load XML
A. Load existing XML 1 Xmldocument Doc = New Xmldocument ();
Doc. Load (server. mappath ( " Students. xml " ));

B. Create XML Xmldocument Doc = New Xmldocument ();
String Strxml = " <Students>
<Student> <ID> 1 </ID> < Name > Hyq </ Name > < Age > 24 </ Age > </ Student >
< Student > < ID > 2 </ ID > < Name > Hyq2 </ Name > < Age > 25 </ Age > </ Student >
< Student > < ID > 3 </ ID > < Name > Hyq3 </ Name > < Age > 26 </ Age > </ Student >
< Student > < ID > 4 </ ID > < Name > Hyq4 </ Name > < Age > 27 </ Age > </ Student >
</ Students > " ;
Doc. loadxml (strxml );

2. Obtain the values of all lower-level nodes. 1 Xmldocument Doc=NewXmldocument ();
Doc. Load (server. mappath ("Students. xml"));

2 Xmlnodelist topm =  Doc. documentelement. Childnodes;
3 Stringbuilder Str =   New Stringbuilder ( " <Ul> " );
4 Foreach (Xmlnode Node In Topm)
5 {
6
7 Str. append ( " <Li> Name: "   + Node. childnodes [ 1 ]. Innertext +   " ; Age: "   + Node. childnodes [ 2 ]. Firstchild. innertext +   " </LI> " );
8
9 }
10 Str. append ( " </Ul> " );
11 Lb_xml.text = Str. tostring ();

PS: above Code The "green" part of the node is used to obtain the root node. Another method is to obtain all nodes. If you only obtain some nodes, we recommend that you use this method. Selectnodes
1 Xmlnodelist nodelists = Doc. selectnodes ( " Students/student " )
2   Foreach (Xmlnode Node In Nodelists)
3 {
4
5 Str. append ( " <Li> Name: "   + Node. childnodes [ 1 ]. Innertext +   " ; Age: "   + Node. childnodes [ 2 ]. Firstchild. innertext +   " </LI> " );
6
7 }
8 Str. append ( " </Ul> " );
9 Lb_xml.text = Str. tostring ();

3. Add nodes Add an existing node copy
1 Xmlnode node2 = Doc. documentelement. childnodes [ 0 ]. Clonenode ( True );
2 Node2.childnodes [ 0 ]. Innertext =   " 6 " ;
3 Node2.childnodes [ 1 ]. Innertext =   " Second " ;
4 Node2.childnodes [ 2 ]. Innertext =   " 135 " ;
5 Doc. documentelement. appendchild (node2 ); Add new nodes
1 Xmlnode node1 = Doc. createnode (xmlnodetype. element, " Job " , "" );
2 Xmlnode node11 = Doc. createnode (xmlnodetype. element, " Name " , "" );
3 Node11.innertext =   " Net " ;
4 Node1.appendchild (node11 );
5 Doc. documentelement. appendchild (node1 );

PS: In this example, adding a node under the root node is used as an example. If the node is changed accordingly, the node or attribute can be added to any node.
Note the node. clonenode (bool deep) method. When deep is set to true, it indicates the subnode and itself under the replication node; when deep is set to false,
Copy only yourself.
4. Delete a node Doc. documentelement. removechild (xmlnode node)

(Simple tasks, simple processing)